Page:UK Traffic Signs Manual - Chapter 8 - Part 2- Traffic Safety Measures and Signs for Road Works and Temporary Situations) - Operations 2009.pdf/85

 *rear vehicle markings most visible; and
 * driver of vehicle is not exposed to direct impact on exiting vehicle.

Disadvantages:


 * may appear to approaching drivers that the vehicle is moving;
 * does not fill the lane, therefore offering only a limited line of defence; and
 * if the vehicle is struck it will travel forward and may breach the safety zone.

Whatever position is adopted, in all cases the vehicle should be left with its front wheels steered straight ahead i.e. parallel to the vehicle, and in the case of a vehicle fitted with an automatic gearbox, with the gear selector in "park". The handbrake shall be set and if available, the four-wheel drive mode engaged. If it is necessary to leave the engine running, “run lock” should be used, if available.

The first to arrive at the scene shall:
 * stop before the incident with flashing roof-mounted beacons on. The distance before the incident on dual carriageways should be 50 m, and on single carriageway roads, should be a safe distance (see paragraph );
 * notify the emergency services or traffic officers if needed;
 * protect the scene with a high-conspicuity vehicle or IPV (see paragraph O5.5.5) (if available);
 * place a "keep left/right" sign behind the vehicle (or activate the light arrow if available);
 * arrange for EMS/VMS to be activated if the incident cannot be cleared quickly;
 * deploy a 100 m minimum (50 m on 30 mph roads) cone taper per lane;
 * deploy additional diagram 610 "keep left/right" signs along taper;
 * deploy advance warning signs if appropriate; and
 * in reduced visibility, deploy warning lights along taper.

The ISU shall: 83
 * replace ETM with TTM, if the incident is likely to last longer than 90 minutes;
 * deal with the incident;
 * clear the carriageway;
 * remove the ETM; and
 * reopen carriageway.